Road-oil-spreading nozzle.



D. W. JOHNSTON & G. G. 84 S. S. GIRLING.

ROAD 0H SPREADING NOZZLE. APPLICATION FILED SEPT. 25. 916.

1,243,417 Patented Oct, 16,1917. I

aweri ELL, BY? 5 UNTTED rm earner onnrcn.

DAVID W. JOHNSTON, GEORGE G. GIBLING, AND SIDNEY S. GIRLING, OF SAANICH, VANCOUVER ISLAND, BRITISH COLUMBIA, CANADA.

ROAD-OIL-SPREADING NOZZLE.

Specification of Letters Patent.

Patented Oct. 16, 1917.

Application filed September 25, 1916. Serial No. 122,075.

To all whom it may concern:

Be it known that we, DAVID l/V. Jonnsron,

GEORGE G. Granite, and Smxnr S. GIRLING, citizens of the Dominion of Canada, res1d-.

ing at Saanich, Vancouver Island, in the Province of British Columbia, Canada, have invented certain new and useful Improvements in Road-Oil-Spreadirw Nozzles, .of which the following is a specification.

This invention relates to an improved means for forcibly delivering a spray of heavy road oil or heat liquefied asphaltum over a road surface.

The material with which traffic roads now require to-be dressed, whether road oil or asphaltum, should not only be evenly spread over the surface but beforcibly delivered thereto, as it is thereby enabled to further penetrate the interstices of the road metal, and ifthe material is to be applied hot, as is necessary with asphaltum and may be desirable with other dressings, the delivery should be as direct as possible that itmay not lose its heat before it reaches the road surface.

Road dressing material being of a strongly viscid character is not suitable for expression through small apertures or slits, as such apertures are liable to obstruction and the power necessary'to force a viscid material througha small aperture absorbs a considerable amount of power and the apertures or slits are liable to obstruction.

Attempts have been made to use a reason ably large aperture and effect the fine division and dispersion of the spray by imparting a whirling movement to the issuing jet, but in such case the power applied to the material is largely absorbed in imparting the whirling movement, and the finely divided particles are not forcibly delivered to the road surface but practically fall by gravity. Further not being directly delivered to the road surface, if the material is to be used hot, the heat is lost before it reaches the road.

If steam is used to effect the expression and dispersion of the road dressing material the presence of the water of condensation prevents proper adherence of the applied dressing to the material of the road, and if compressed air is delivered with the jet to induce its flow and effect its dispersion the sudden expansion of that air at the nozzle cools the issuing spray.

The invention, which is the subject of this application, has been designed to forcibly deliver the road dressing material in an in tact flattened film, direct to the road surface, with substantially the full energy of the power applied to enforce its flow, whereby the material may be delivered hot onto the surfaceof the road andwith force sufficient to insure its penetration.

The invention is particularly described in the following specification, reference being made to the drawings by whichit is accompanied, in which:

Figure 1 is a vertical cross section through the opposed delivery nozzles through which the road dressing material is delivered.

Fig. 2 is a longitudinal section of the same.

Fig. 3 is an elevation showing the arrangement of the nozzles across the road width to be treated, and

Fig. 4, a plan of the same.

In these drawings 2 represents the pipe, transverse of the, road, to which the road dressing material is. delivered under pressure from a reservoir or supply tanlrwhich is mounted preferably on a self-propelled vehicle. This tank may have means for maintaining the road dressing material at the required heat to insure sufficient fluidity and adherence to the road metal and its delivery under pressure may be accomplished in any convenient manner, such as by a small rotary pump in the delivery pipe. At intervals in this cross pipe 2 ducts 3 deliver to converging opposed nozzles 4, the axes of which are in planes normal to the axis of the cross pipe.

These nozzles are of such size, say about three-eighths of an inch in diameter, that they will not be subject to obstruction by inequalities in the road dressing material.

Each nozzle is bored with a parallel portion where it connects to the duct 3 from the servicepipe 2 and therefrom to the orifice is tapered with a curvature that will under the pressure to be used project a practically cystices of the road metal and without-sensible loss of heat, is the most effective means of applying a road dressing of oil or the like.

The spread of the film 5 being across the road only, the material is. with the movement of the vehicle applied to the road surface in a uniform sheet and thereforein a much more effective manner than it can be applied by means of a centrifugally divided spray, which, depositing in a circle, will with the movement of the vehicle apply a larger quantityin lines adjacent themiddle of the transverse diameter than it will adjacent the ends of the same 7 In applying these opposed nozzles to effect the spraying'cof a road surface, they are preferably arranged, as shown in Figs. 8 and i, withthree pairs of nozzles across the width of the road surface to be treated, the two outerones delivering the film in the same plane and the middle one ofiset before or behind that plane, sothat the extreme edges of the'film from adjacent nozzles may overlap slightly to insure a uniform distribution over the road width without interfering,

We are aware that the principle of opposed converging j etsis not broadly new, asit has been applied to obtain a finely divided spray of water or the like for moistening' air, but believe that wehave been the first torapply the principle of opposed jets to obtain a: thin fiat film of viscous material, such-as road oil, by providing deliveryv nozzles which are designed to project an essentially compact jet, which on im pact with its opposed jet flattens: with it into a thin film and proceeds directly to the surface against which it is projected, in stead. of breaking up into a finely divided spray. V

Having now particularly described our invention, we hereby declare that what we surface, said means comprising opposed nozzles having free discharge ends the axes of which nozzles angularly converge and the bore of which is adapted to deliver a compact jet to the place of intersection, and means for delivering thematerial' to both nozzles from: a common source.

2. A means, for applying a thin flat film of" a vi'scid material such as road oil, toa surface, said means comprising nozzles having free discharge ends, the axes of which angularlynconvergein the same plane and the bore of which is adapted to deliver a compact substantially cylindricaljet to the place of intersection, and means for delivering the material to both nozzles from a commonsource.

3'. A means for applying a thin fiatfilm of a viscid material: such as road oil, to a surface, said means comprising the combination witlra pipe of ductsdelivering from one side of the pipeto oppositesidesysaid ducts delivering intor nozzles, the axes; of

nation with a pipe ofducts delivering from one side of the npe to oppositesldes, Sillfil ducts delivering into nozzles, the axes of which are a plane normal tothe-axisof" the pipe from which they are derived and converge to intersectbelow said pipe, the

hereof each nozzle-being cylindrical for ashort distance and thereafter contracted with a convex curvature to the outlet.

' 5. A means for applying a thin flat film of a viscid material such as road oil, to a surface, said means comprising the combination with a transverse-pipe, of a series of opposednozzles derived fromsuch pipe, theaXesof each pair of'nozzles: being in a plane normal to the axis of the. transverse pipe and converging'to intersectwbelow it,1

the point of intersection of each alternate pair of nozzles being'inth'e same plane, and those of the interveningnozzles being in a plane parallel thereto.) r

In testimony whereofwea-flix oursignas tures. I

' DAVID W. JOHNSTON.

GEORGE G. 'GIRLING. SIDNEY S. GIRLING;

Copies of'this pateutmay be; obtained for five cents each,L lay-addressing the Commissioner offlatents;

Washingtomh. 0;. 

